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Full text of "The Flow Of Gases In Furnaces"

DESIGN OF OPEN-HEARTH FURNACES

273


	Gas on Gas
	Air on Air
	Gas on Waste Gas
	Air on Waste
 Gas

Frictional resistance in checkers: SL = heating surface = m2 == ......
	2560
	4267 5
	
	

co = total area of passes m2 ......
	11.664
	19 440
	
	

$ L ~i~ w ==
	219 5
	219 5      t
	
	

vt = velocity m per sec
	1 879
	1 642
	2 405
	1 964

AO = specific weigh *"< gases
	1  125
	1 293
	1 320
	1 320

t =s average temperature .
	850
	750
	1200
	1100

1 -\-<xt ==gas factor for t = .
	4 1195
	3 7525
	5 4040
	5 0370

Aj = Ao-J-(l+aO = .............
	0.2731
	0 3445
	0 2443
	0 2621

y=kg per m2 friction loss X =0.016X219.5X 1.879X0.273 =
	1 kg 802
	
	
	

0.016X219.5X1.642X0.3445 =
	
	1 kg 987
	
	

0.016X219.5X2.405X0.244  =
	
	
	2 kg 064
	

0.016X219.5XL964X0.2621 =
	
	
	
	1 kg 808


	
	
	
	

As the gases enter and leave the checkerwork they make a 90
change in their direction of flow, which is equivalent to a total
absorption of their velocity head. The pressure necessary to
impress upon the flowing gases their velocity in the checkers will be:


	Gas
	Air
	Gas on
	Air on


	on
	on
	Waste
	Waste


	Gas
	Air
	Gas
	Ga

h =vt-r- 2g~ meters of gas   olumn.
	0.180
	0.137
	0.295
	0.197

5 == h&t  kg per m2 = ...........
	0. 49
	0.047
	0.072
	0 052